Abstract
Already in the 1938 English edition of his book “The Origin of Life” A. I. Oparin (3) gave strong reasons for the assumption that the primordial or primitive atmosphere of the Earth was a “reducing atmosphere,” consisting mainly of hydrogen, methane, ammonia, water vapour, and noble gases. In addition he presented many facts supporting the assumption that carbon appeared first on the Earth’s surface, not in the oxidized form of carbon dioxide, but in the reduced state in the form of hydrocarbons. He added that nitrogen first appeared, with a high degree of probability, like carbon, also in its reduced state, in the form of ammonia. These assumptions were later on supported by H. C. Urey (4), W. Kuhn (5), J. D. Bernal (6), and others.
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